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Postretirement Benefit Plans - Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Detail) - Qualified Defined Benefit Pension Plans - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Plans where ABO was in excess of plan assets
Projected benefit obligation	$ 42,444	$ 48,628
Less: fair value of plan assets	31,034	32,925
Unfunded status of plans	(11,410)	(15,703)
Plans where ABO was less than plan assets
Projected benefit obligation	51	58
Less: fair value of plan assets	158	170
Funded status of plans	$ 107	$ 112

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- Definition

The unfunded or funded status of pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

No definition available.

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- Definition

Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations Less Than Plan Assets [Abstract]

+ References

No definition available.

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- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations less than plan assets as of the measurement date of each statement of financial position presented.

+ References

No definition available.

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- Definition

If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations less than plan assets as of the measurement date of each statement of financial position presented.

+ References

No definition available.

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- Definition

The unfunded or funded status of pension plans with accumulated benefit obligations less than plan assets as of the measurement date of each statement of financial position presented.

+ References

No definition available.

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- Definition

Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920

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- Definition

Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921

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